Steam-valve gear for duplex steam-pum ps



(No Model.) 2 sheets-'sheet 1.

J. s. KLEIN. y

STEAM VALVE GEAR FORl DUPLEX STEAM PUMPS.

No. 336,924. Patented Mar. 2, 1886. I

(No Model.) 2 Sheets-Sheet 2.`

J. s, KLEIN. l

STEAM VALVE GEAR POR DUPLEX STEAM PUMPS. No. 336,924. Patented Mar, 2,1886,.

llilin l NITED STATES.

" ATENT trice.

JOHN S. KLEIN, OF OIL CITY, PENNSYLVANIA.

`:EPLECIFICATION forming part of Letters Patent No, 336,924, dated March2, 1886. Application tiled September 11, 1885. Serial No. 176,805. (Nomodel.)

.T0 all whom t may concern:

Be it known that I, JOHN S. KLEIN, a citizen of the United States,residing at Oil City, in the county of Veuango and State ofPennsylvania, have invented certain new and useful Improvements inSteam-Valve Gear for Duplex Steam-Pu mps; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to steampumps; and it consists in improvements onthe valvegear for duplex steam-pumps.

My invention is shown in the accompanying drawings, as follows: Figure lis a perspective View of a duplex steam-pump having thereon my improvedvalve-gear. Fig. 2 is a side elevation of the valve-gear. Fig. 3 is aperspective view of one of the rocker-arms and the cam by which it isoperated. Fig. 4 is a transverse vertical section through the bed orframe and piston-stems, and shows the valve-gear in end elevation. Fig.5 isa top or plan View of the valvegear with the rockerarin sleeves inhorizontal section.

A A are the steam-cylinders. G G are the pump-cylinders. F F are thepiston-rods. a a are the steam-valve stems. B B are the rocker-arms,which move the steamvalve stems a and a, respectively. C C are thejournalsleeves of the rocker-arms B and B, respectively. D D are thecams which move the rocker-arms B and B', respectively. E E' arecam-followers, which are attached to the piston-rods F and F,respectively, and serve to move the cams D and D', respectively. I isthe journal-pin of the rocker-arms, and His a hub connected with thebed, which holds the 4o j ou rnal-pin l.

The construction and operation of my invention are as follows:

The two pumps are operated alternately, and the steam-valve of one isoperated from the piston-stem of the other-that is to say, one pumpmakes a full stroke one way, while the other stands still, and as itcompletes said stroke it opens the steam-valve of the other pump, and itmakes a full stroke the other way while the first pump stands still.Connected with the journal-sleeve of each rocker-arm is a cam, whichlies above the piston-stem of the opposite pump. Thus the rocker-arm B,which moves the stealnvalve stem a of the pump A G, is connected with acam, D, which lies over the piston-stem which moves the valve-stem a ofthe pump A G, is connected with a cam, D, which lies over thepiston-stem F of the pump A G.

Fig. 3 shows the construction ofthe rockerarm B, its journal-sleeve C.and the cam D, and it will there be seen that these parts are all formedof one piece of metal; but this is not essential. The other rocker-armand cam are constructed in the same manner, and are counterparts ofthose seen in Fig. 3, except that the cam is reversed. Thejournal'sleeves of both are notched or cut away, so that the two partscan each span the hub H, one reaching around the hub on one side and theother on the other side. This is clearly seen in Fig. 5. By thisconstruction each rockerarm has a bearing on the pin I on each side ofthe hub H. This is simply for thepurpose of giving a long iirm bearing,and it gives a bearing opposite the connection ofthe rockerarm'with thevalve-stem; but of course this is not essential. The two cams stand,when in place, reversed-that is, the slot in the cam D curves up at theends, and that of D curves down. The cams are rocked by the reciprocalaction of the cam-followers E E', which are connected with thepistonstems F and F, respectively. The said cam-followers consist of ahead or block connected with the pistonstems and bearingfriction-rollers which lieiu the slots of the cams.

The cams D D constitute an essential part of my invention, as by themthe admission of steam to and cutting of steam oft from the cylinder ofone pump is effected by the action ofthe other pump. It is comlnon induplex steam-pumps to move the steanrvalve of one pump by the actionofthe other pump through the medium of a rocker-arm and a connectingrod.With such a valvegear there is no point in the stroke of the piston inwhich there is no movement of the steam-valve it actuates. One oftheresults of this construction is, that where the pump is working light,as in draw ing air from a conduit as it is flling'with iluid,

Fot` the pump A G', and the rocker-arm B,

rco A it will not make full strokes, but short, rapid ones. Anotherobjection to such a valve-gear is, that after a piston has completed itsstroke no cut-off of steam occurs until it is time for that piston tomove back again. In other words, the valves are moved from one end oftheir stroke to the other at one movement, so that when they stand theyare admitting steam to the cylinders at one end or the other. In somecases this is not a disadvantage, while in others it causes a greatconsumption of steam.

By the use oi' my rocking cams D D, I overcome both the aboveobjections, for, in the first place, they have a straight space in theirslots,which allows the pistons to move without moving them, and they canonly be moved as the pistons are beginning or ending a stroke, and, inthe next place, when constructed as shown they move the valve twice tocomplete one stroke or traverse ofthe valve. Thus, for exa1nple,when thepiston F starts to move, it will iirst move the cam D', so as to closethe valve of the pump A G, and then, as it completes its stroke, it willagain move the cam D in the same direction it did at iirst, and thiswill open the valve of the pump A G. This latter feature where notwanted wiltbe dispensed with by omitting the lower bar ot' the cam Dland the upper one of the cam D, or the inclined faces on said hars. To afull understanding of the action ofthe valvegear, I will describe itscomplete operation.

Beginning with the parts in the position shown in Fig. l, thepiston-stem F is just completing its stroke toward the right, and thecam-follower E is just impinging upon the lower inclined face at theangle ot' cam D. As this stroke is completed, the cam D is tilted downat its right end. This rocks the arui B to the right and opens the valveof pump A G, so as to admit steam to the left of the cylinder A. Thisaction starts the pistonstem F on its stroke toward the right, and as itstarts the canrfollower E will tilt the cam D down at its left end androck the arm B to ward the left, and thus close the valve of the pump AG. Then the "piston-stem F is about completing its stroke toward theright, the cam-follower E -will strike upon the upper inclined face atthe right end of cam D, and tilt the said cam again in the samedirection as before, and move the valve ot' the pump A G still fartherto the left, which will open the part at the right end ofthe cylinder A,and start the piston-stein F' on its return-stroke, and as it moves tothe left it tilts up the right end ot' the cam D and closes the valve ofcylinder A.

From the foregoing it will be seen that if, as above stated, the camswere so formed that there were no cam-faces on the upper side ot' cam Dnor on the lower side of cam D, the valves would only be moved once ineither direction in making a full traverse, and hence they would have tobe so formed that they would be admitting steam to the cylinders all thetime, either at one end or the other, just as is common in theconstructions heretofore in use. So it will be seen that I can soconstruct my cams as to either cut ott' the steam from the cylinderswhile their pistons are at rest or not, as desired. It will also beobserved that in either case the cams will not be moved, and thereforethe valves will not be moved except as the pistons are at the beginningror finish of their strokes, and therefore it, will be impossible for thepumps to run with short quick strokes, for the pistons must make fullstrokes in order to eli'eet a cut-oit' or admission of steam.

What I claim as new is- I. In a duplex steanrpump, a valve-gearconsisting of the combination ot' a rocking cam which consists of a barpivoted at its middle and having a Cain-slot formed, as shown, withupper and lower cani-faces at each end and a dwell between the ends,arranged adjacent to the piston-stem of each pump, a cam-follower oneach piston-stem, by which said cams are rocked as the said piston-stemsreciprocate, and rocker-arms connected with the pivot of each of saidcams, and with the valve-stem of the opposite pump.

2. In a duplex steam-pump, a valve-gear which consists of the cams D D,joui-nah sleeves C C', rocker arms B B', and cam-followers E E, combinedand arranged to operate substantially as and for the purposes set forth.

3. In a duplex steam-pump valvegear, the combination, substantially asshown, of the cam-followers E E', connected with the pistons F F,respectively, and the two rocking gears formed, respectively, of the camD, rocking sleeve C, and arm B, and the cam D', `journalsleeve C', andarm B', and journaled on the common pivot I, and operated from thepiston-stems F F, and connected with the valvestems a a', respectively.

In testimony whereot I atix my signature in presence of two witnesses.

JOHN S. KLEIN.

Witnesses:

JNO. K. HALLooK, RoBT. H. PORTER.

IOC

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